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__________ are often used where very rapid access is required, where fixed-length records are used, and where records are always accessed one at a time.

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Final answer:

Indexed files enable rapid access to data, are used with fixed-length records, and support single-record access at a time, making them ideal for performance-critical applications.

Step-by-step explanation:

Indexed files are often used where very rapid access is required, where fixed-length records are used, and where records are always accessed one at a time. This method of file organization allows for efficient, direct access to data records based on their key, which can lead to faster retrieval times compared to other methods such as sequential access. Indexed files are preferable in environments where performance is critical, such as in database management systems or certain real-time applications.

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